Medically reviewed by Natalie Muth, M.D., MPH, RDN, FAAP, FACSMMedically reviewed by Natalie Muth, M.D., MPH, RDN, FAAP, FACSM It can be hard to tell what's normal when it comes to baby poop, ...

Understand the first dirty diapers. Early poop is meconium: a black or dark-green, thick, sticky, tar-like substance. It’s made up of intestinal cells, lanugo (the downy hair some babies are born with ...